百度地图之添加覆盖物并响应事件

本文中将介绍在百度地图上添加覆盖物的功能、响应点击功能和弹出pop功能，代码来自百度Demo：

Activity：

package com.home;

import java.util.ArrayList;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.baidu.mapapi.BMapManager;
import com.baidu.mapapi.map.ItemizedOverlay;
import com.baidu.mapapi.map.MapController;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.OverlayItem;
import com.baidu.mapapi.map.PopupClickListener;
import com.baidu.mapapi.map.PopupOverlay;
import com.baidu.platform.comapi.basestruct.GeoPoint;

/**
 * 演示覆盖物的用法
 */
public class OverlayActivity extends Activity {

	/**
	 * MapView 是地图主控件
	 */
	private MapView mMapView = null;
	/**
	 * 用MapController完成地图控制
	 */
	private MapController mMapController = null;
	private MyOverlay mOverlay = null;
	private PopupOverlay pop = null;
	private ArrayList<OverlayItem> mItems = null;
	private TextView popupText = null;
	private View viewCache = null;
	private View popupInfo = null;
	private View popupLeft = null;
	private View popupRight = null;
	private Button button = null;
	private MapView.LayoutParams layoutParam = null;
	private OverlayItem mCurItem = null;
	/**
	 * overlay 位置坐标
	 */
	double mLon1 = 116.400244;
	double mLat1 = 39.963175;
	double mLon2 = 116.369199;
	double mLat2 = 39.942821;
	double mLon3 = 116.425541;
	double mLat3 = 39.939723;
	double mLon4 = 116.401394;
	double mLat4 = 39.906965;
	double mLon5 = 116.402096;
	double mLat5 = 39.942057;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		/**
		 * 使用地图sdk前需先初始化BMapManager. BMapManager是全局的，可为多个MapView共用，它需要地图模块创建前创建，
		 * 并在地图地图模块销毁后销毁，只要还有地图模块在使用，BMapManager就不应该销毁
		 */
		DemoApplication app = (DemoApplication) this.getApplication();
		if (app.mBMapManager == null) {
			app.mBMapManager = new BMapManager(this);
			/**
			 * 如果BMapManager没有初始化则初始化BMapManager
			 */
			app.mBMapManager.init(DemoApplication.strKey,
					new DemoApplication.MyGeneralListener());
		}
		/**
		 * 由于MapView在setContentView()中初始化,所以它需要在BMapManager初始化之后
		 */
		setContentView(R.layout.activity_overlay);
		mMapView = (MapView) findViewById(R.id.bmapView);
		/**
		 * 获取地图控制器
		 */
		mMapController = mMapView.getController();
		/**
		 * 设置地图是否响应点击事件 .
		 */
		mMapController.enableClick(true);
		/**
		 * 设置地图缩放级别
		 */
		mMapController.setZoom(14);
		/**
		 * 显示内置缩放控件
		 */
		mMapView.setBuiltInZoomControls(true);

		initOverlay();

		/**
		 * 设定地图中心点
		 */
		GeoPoint p = new GeoPoint((int) (mLat5 * 1E6), (int) (mLon5 * 1E6));
		mMapController.setCenter(p);
	}

	public void initOverlay() {
		/**
		 * 创建自定义overlay
		 */
		mOverlay = new MyOverlay(getResources().getDrawable(
				R.drawable.icon_marka), mMapView);
		/**
		 * 准备overlay 数据
		 */
		GeoPoint p1 = new GeoPoint((int) (mLat1 * 1E6), (int) (mLon1 * 1E6));
		OverlayItem item1 = new OverlayItem(p1, "覆盖物1", "");
		/**
		 * 设置overlay图标，如不设置，则使用创建ItemizedOverlay时的默认图标.
		 */
		item1.setMarker(getResources().getDrawable(R.drawable.icon_marka));

		GeoPoint p2 = new GeoPoint((int) (mLat2 * 1E6), (int) (mLon2 * 1E6));
		OverlayItem item2 = new OverlayItem(p2, "覆盖物2", "");
		item2.setMarker(getResources().getDrawable(R.drawable.icon_markb));

		GeoPoint p3 = new GeoPoint((int) (mLat3 * 1E6), (int) (mLon3 * 1E6));
		OverlayItem item3 = new OverlayItem(p3, "覆盖物3", "");
		item3.setMarker(getResources().getDrawable(R.drawable.icon_markc));

		GeoPoint p4 = new GeoPoint((int) (mLat4 * 1E6), (int) (mLon4 * 1E6));
		OverlayItem item4 = new OverlayItem(p4, "覆盖物4", "");
		item4.setMarker(getResources().getDrawable(R.drawable.icon_markd));

		GeoPoint p5 = new GeoPoint((int) (mLat5 * 1E6), (int) (mLon5 * 1E6));
		OverlayItem item5 = new OverlayItem(p5, "覆盖物5", "");
		item5.setMarker(getResources().getDrawable(R.drawable.icon_gcoding));
		/**
		 * 将item 添加到overlay中 注意： 同一个item只能add一次
		 */
		mOverlay.addItem(item1);
		mOverlay.addItem(item2);
		mOverlay.addItem(item3);
		mOverlay.addItem(item4);
		mOverlay.addItem(item5);
		/**
		 * 保存所有item，以便overlay在reset后重新添加
		 */
		mItems = new ArrayList<OverlayItem>();
		mItems.addAll(mOverlay.getAllItem());
		/**
		 * 将overlay 添加至MapView中
		 */
		mMapView.getOverlays().add(mOverlay);
		/**
		 * 刷新地图
		 */
		mMapView.refresh();

		/**
		 * 向地图添加自定义View.
		 */
		viewCache = getLayoutInflater()
				.inflate(R.layout.custom_text_view, null);
		popupInfo = (View) viewCache.findViewById(R.id.popinfo);
		popupLeft = (View) viewCache.findViewById(R.id.popleft);
		popupRight = (View) viewCache.findViewById(R.id.popright);
		popupText = (TextView) viewCache.findViewById(R.id.textcache);

		button = new Button(this);
		button.setBackgroundResource(R.drawable.popup);

		/**
		 * 创建一个popupoverlay
		 */
		PopupClickListener popListener = new PopupClickListener() {
			@Override
			public void onClickedPopup(int index) {
				if (index == 0) {
					// 更新item位置
					pop.hidePop();
					GeoPoint p = new GeoPoint(mCurItem.getPoint()
							.getLatitudeE6() + 5000, mCurItem.getPoint()
							.getLongitudeE6() + 5000);
					mCurItem.setGeoPoint(p);
					mOverlay.updateItem(mCurItem);
					mMapView.refresh();
				} else if (index == 2) {
					// 更新图标
					mCurItem.setMarker(getResources().getDrawable(
							R.drawable.nav_turn_via_1));
					mOverlay.updateItem(mCurItem);
					mMapView.refresh();
				}
			}
		};
		pop = new PopupOverlay(mMapView, popListener);
	}

	/**
	 * 清除所有Overlay
	 * 
	 * @param view
	 */
	public void clearOverlay(View view) {
		mOverlay.removeAll();
		if (pop != null) {
			pop.hidePop();
		}
		mMapView.removeView(button);
		mMapView.refresh();
	}

	/**
	 * 重新添加Overlay
	 * 
	 * @param view
	 */
	public void resetOverlay(View view) {
		clearOverlay(null);
		// 重新add overlay
		mOverlay.addItem(mItems);
		mMapView.refresh();
	}

	@Override
	protected void onPause() {
		/**
		 * MapView的生命周期与Activity同步，当activity挂起时需调用MapView.onPause()
		 */
		mMapView.onPause();
		super.onPause();
	}

	@Override
	protected void onResume() {
		/**
		 * MapView的生命周期与Activity同步，当activity恢复时需调用MapView.onResume()
		 */
		mMapView.onResume();
		super.onResume();
	}

	@Override
	protected void onDestroy() {
		/**
		 * MapView的生命周期与Activity同步，当activity销毁时需调用MapView.destroy()
		 */
		mMapView.destroy();
		super.onDestroy();
	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		mMapView.onSaveInstanceState(outState);

	}

	@Override
	protected void onRestoreInstanceState(Bundle savedInstanceState) {
		super.onRestoreInstanceState(savedInstanceState);
		mMapView.onRestoreInstanceState(savedInstanceState);
	}

	public class MyOverlay extends ItemizedOverlay {

		public MyOverlay(Drawable defaultMarker, MapView mapView) {
			super(defaultMarker, mapView);
		}

		@Override
		public boolean onTap(int index) {
			OverlayItem item = getItem(index);
			mCurItem = item;
			if (index == 4) {
				button.setText("这是一个系统控件");
				GeoPoint pt = new GeoPoint((int) (mLat5 * 1E6),
						(int) (mLon5 * 1E6));
				// 创建布局参数
				layoutParam = new MapView.LayoutParams(
				// 控件宽,继承自ViewGroup.LayoutParams
						MapView.LayoutParams.WRAP_CONTENT,
						// 控件高,继承自ViewGroup.LayoutParams
						MapView.LayoutParams.WRAP_CONTENT,
						// 使控件固定在某个地理位置
						pt, 0, -32,
						// 控件对齐方式
						MapView.LayoutParams.BOTTOM_CENTER);
				// 添加View到MapView中
				mMapView.addView(button, layoutParam);
			} else {
				popupText.setText(getItem(index).getTitle());
				Bitmap[] bitMaps = { BMapUtil.getBitmapFromView(popupLeft),
						BMapUtil.getBitmapFromView(popupInfo),
						BMapUtil.getBitmapFromView(popupRight) };
				pop.showPopup(bitMaps, item.getPoint(), 32);
			}
			return true;
		}

		@Override
		public boolean onTap(GeoPoint pt, MapView mMapView) {
			if (pop != null) {
				pop.hidePop();
				mMapView.removeView(button);
			}
			return false;
		}

	}

}

地图工具类（BMapUtil）同上文。
custom_text_view.xml同上文。

配置文件及Application类均与之前的一样。

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/clear"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="2dip"
            android:layout_marginLeft="2dip"
            android:layout_marginRight="2dip"
            android:layout_marginTop="2dip"
            android:layout_weight="1"
            android:background="@drawable/button_style"
            android:onClick="clearOverlay"
            android:padding="10dip"
            android:text="清除(clear)" />

        <Button
            android:id="@+id/resert"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="2dip"
            android:layout_marginLeft="2dip"
            android:layout_marginRight="2dip"
            android:layout_marginTop="2dip"
            android:layout_weight="1"
            android:background="@drawable/button_style"
            android:onClick="resetOverlay"
            android:text="重置(reset)" />
    </LinearLayout>

    <com.baidu.mapapi.map.MapView
        android:id="@+id/bmapView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true" />

</LinearLayout>

附上图片效果：